Feature extractor for quasi-periodic signals

Details Feature extractor for quasi-periodic signals Feature extractor for quasi-periodic signals

1985-10-07

1987-07-07

Tokar, Michael J.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Analysis of complex waves

324 77B, 324 78D, G01R 2316

Patent

active

046789871

ABSTRACT:
The purpose of the disclosed structure is to extract features from the emissions of quasi-periodic signal sources, such as piston engine powered vehicles and the like, after which pattern classification can proceed by any of a number of known methods. The structure consists of a phase locked loop, a bank of discrete-time filters, and a microcomputer. The filter bank is tuned by changing the clock rates, which are derived from the phase locked loop, which is locked to the signal fundamental frequency. The microcomputer is used to acquire the fundamental frequency and the filter tuning is such that each filter tracks a single harmonic.

REFERENCES:
patent: 4270150 (1981-05-01), Diermann
patent: 4351216 (1982-09-01), Hamm
patent: 4415854 (1983-11-01), Remy
patent: 4504833 (1985-03-01), Fowler et al.
patent: 4514769 (1985-04-01), Gallo

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